asp.net - how to change label with button in vb? -

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so want have button changes text of label when click , says page not available, when comment out update panel atleast shows up.

   <form id="form1" runat="server">     <asp:scriptmanager id="s1" runat = "server"></asp:scriptmanager> <div> <h1>update panel test page</h1> start text : hello <br /> updated text: world<br />     <hr />  <asp:updatepanel id="p1" runat="server">     <contenttemplate>   <asp:button id="button1" runat="server" text="update"  onclick="updatelabel" height="29px" width="110px"/> -->         text: <asp:label id="label1" runat="server" text="hello"></asp:label>      </contenttemplate> </asp:updatepanel>     </div> </form>

codebehind

   public class aaaa inherits system.web.ui.page  protected sub page_load(byval sender object, byval e system.eventargs) handles me.load  end sub  function updatelabel() string     label1.text = "world" end function end class

you can remove onclick button , try classic method of handling events. code be... ( sorry i'm posting via app might not in code view ) 

protected sub changelabel(byval sender object, byval e system.eventargs) handles button1.click  label1.text = "textgoeshere"  end sub

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